Like some RFID tags here-to-fore commercially available, an RFID or sensor tag of the present developmental type includes one-port surface-acoustic-wave (SAW) devices. Additional pairs of antenna elements connected by equal-length transmission lines can be incorporated into a Van Atta array to increase its directionality. The effective gain of a Van Atta array is the same as that of a traditional phased antenna array having the same number of antenna elements. Hence, an RFID tag equipped with a Van Atta antenna array automatically tracks the interrogating transceiver. The phase relationships among the received and reradiated signals are such as to produce constructive interference of the reradiated signals that is, to concentrate the reradiated signal power in a direction back toward the source. In its simplest form, a Van Atta array comprises two antenna elements connected by a transmission line so that the signal received by each antenna element is reradiated by the other antenna element (see Figure 1). The retroreflective antenna array is, more specifically, a Van Atta array, named after its inventor and first published in a patent issued in 1959. Therefore, for a given amount of power radiated by the transmitter in the interrogating transceiver, a tag of this type can be interrogated at a distance greater than that of the comparable passive RFID or sensor tag of prior design. A tag of this type incorporates a retroreflective antenna array, so that it reflects significantly more signal power back toward an interrogating radio transceiver than does a comparable passive RFID tag of prior design, which does not incorporate a retroreflective antenna array. Barton, RichardĮxtended- range passive radio-frequency identification (RFID) tags and related sensor tags are undergoing development. With an inductive antenna printed on a paper substrate around the OCA tag, the reading range can be extended from several centimeters to meters, depending on the shape and size of the inductive antenna.Įxtended- Range Passive RFID and Sensor Tagsįink, Patrick W. Measurement results show that the system's reading range is 2 mm with 20 dBm reader output power. The specialized SOC reader system consists of the RF transceiver, digital baseband, MCU and host interface. A self-defined protocol is proposed to reduce the power consumption, and minimize the size of the tag. The whole tag chip with the antenna takes up an area of 0.36 mm2, which is smaller than other reported tags with an on-chip antenna (OCA) using the standard CMOS process. Qi, Peng Chun, Zhang Xijin, Zhao Zhihua, WangĪ UHF RF identification system based on the 0.18 μm CMOS process has been developed for short range and harsh size requirement applications, which is composed of a fully integrated tag and a special reader.
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